As far as weight loss: There are no real zones. Calories out is calories out. Period. The only reason it’s considered “fat loss” zone is because it is easier to maintain for longer periods and lower impact on your body.
There is literally no difference in burning 400 calories in 30 mins at a fast pace, and burning 400 calories in 2 hours at a walk.
If you are talking heart and cardio vascular health, 30 mins or more at ~150 bpm can improve your health health and lower blood pressure
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